Bottle cap



March 1 1927.

E. G. BAUM BOTTLE CAP Filed March 21. 1924 Patented Mar. 1, 1927.

UNITED sjrirriazs PATENT OFFICE.

.EWALD G. BIAUM, 0F NATICK, MASSACHUSETTS, ASSIGNOR TO SEAL-KAP COMPANY,0F

p 4 NATICK, MASSACHUSETTS, A CORPORATION 0F MASSACHUSETTS.

BOTTLE CAP.

Application filed March 21, 1924. Serial No. 700,836.

This invention relates to bottle caps more especially those designed tocloseoit' the mouths of milk bottles and has for its chief object toprovide a construction whereby the cap may be closed into tight sealingengagement with the bottle regardless of very considerable variations inthe contour of those portions of the bottle with which the cap 1sintended to cooperate.

While not restricted thereto, it is particularly applicable to two-partcaps of the general type illustrated in my application for patent,Serial No. 616,874, filed February 5, 1923, .for milk bottle caps,embodying one part having a pouring lip housing and a bore coveringportion joined thereto by' an annular bottle engaging portion, andanother part comprising a disk overlying the. bore covering portion ofthe first partwith its periphery in engagement with the inner wa'll ofthe pouring lip housing.

Referring tothe accompanying drawings,

Figure l is a plan o the cap.-

Figure 2 is an inverted plan of the same.

Figure 3 is a section on line 3 3 of Figure 2.

Figure 4 is a ramgentary section through the upper portion of a bottlehaving a cap applied thereto. I

Figures 5, 6 and 7 are views similar to Figure 4, but showing the capapplied to bottles having their portions with which the cap seals ofdifferent contours.

The cap comprises two parts, one having an annular pouring lip housingportion l which is shown as corrugated over the upper edge of the.bottle mouth. Immediately within this pouring lip housing is a down-Wardly inclined or frusto conical portion 2 which is arranged to beseated on and to conform to the edge of the annular ledge 3 with whichsuch bottles are. provided below their open ends andon which thecommonly used cardboard closure disks are intended to be seated.Inwardly of the portion 2 is a bore coveringportion comprising asubstantially flat central disk surrounded by a -downwardly andoutwardly inclined annular portion 6. In order to stilenthis cap so thatit holds rmly in position a disk 8 is forced downwardly within thepouring lip housing portion, its periphery resting against and forcingoutwardly the inner wall of this ortion so that when the c ap is appliedto. the bottle it firmly engages the bottle pouring li when it flaresdownwardly and outwarl ly vabove the ledge 3.

The disk portion v8, together with the portions 2 and 6 ofthe other cappart, form an annular portion of substantially triangular cross sectionimmediately within and below the pouring lip housing. When the cap isapplied this portion 2 is conformed to the mating bottle portion andserves as a sealing gasket. portion by the milk tends to soften andswell the paper-board of which the cap is preferably made', so that thissealing gasket action is augmented.

The portion 2 is of considerable width so that it may engage and beconformed to the ledge 3 of the bottle regardless of very considerablevariations in the contour of this ledge or departures from a trulycircular outline. For example, as shown in Figure 4, the ledge 3 isconsiderably rounded merging somewhat gradually Witli the innerwall ofthe bottle 4 immediately therebelow, while in Figure 5 the edge betweenthe ledge 3 and the-inner wall 4 of the bottle is sharply deined andinclines upwardly. ln Figure 6 the ledge is formed substantially dat onits upper face and with its inner edge comparatively sharp, while inFigure 7 it is sloped downwardly at a very considerable angle.Regardless of these variations in contour,- howevei, the annular portion2 may be made to conform thereto as the cap is forced into properseating engagement-with the bottle mouth. Not only does thisconstruction take account of variations in the cross sectional contourof the ledge, but also provides for departures from true circular form.For example, in Figure 2 is shown in dotted lines at l0 the line ofengagement with the portion 2 of the cap of the inner edgeof the ledgewhen this inner edge is elliptical rather than circular, it being notedthat it engages near the outer edge of the portion 2 at oppositelydisposed points a and b and near the inner edge at points c and d'midway between. Of course any other variations or irregularities, solong as the edge of the ledge strikes between the inner and outermargins of the portion 2 are efectually taken care of so that the bottlewill be fully sealed when the cap is applied thereto.

The triangular cross section, hereinbefore mentioned, of which theportion 2 forms one side furnishes a substantial stiffness lto the Themoistening of this the cap.

Having thus described an embodiment of this invention it should beevident that va- .rious modifications and changes might be made therein`without deartmg from its spirit or scope as defined y the appended caims.

I claim:

l. A bottle cap having a bore covering portion terminatlng in anupwardly inclined annular portion to engage and be closely conformed tothe usual internal annular led adjacent to the mouth of a milk bottle anextended downwardly beyond the face of the ledge to form a sealingcontact beneath it and serve as a sealing gasket therefor.

2. A bottle cap having a bore covering portion terminating in anupwardly inclined annular portion to engage and be closely conformed tothe usual internal annular led e adjacent to the mouth of a milk bottlean extended downwardly beyond the face of the ledge to form a sealingcontact beneath it, said annular' portion being of sufficient width tobe conformable to bottles of different internal contours andirregularities and serve as a sealing gasket therefor.

3. A bottle cap oompmsmg a bbre covering portion havingl a marginalportion of triangular section aving one face upwardly and outwardlyinclined and deformable to conform to the inner wall of a milk bottle atand'below the usual internal disk supporting ledge.

4. A bottle cap comprising a bore covering portion havin a marginalportion of triangular section aving one face upwardly and outwardlyinclined and deformable to conform to the inner wall of a milk bottle atand below the usual internal disk supporting ledge, said face being ofsubstantial width to conform to ledge portions of different contours andirregularities.

5. A bottle cap having a bore covering portion, a pouring lip housing,and an annular frusta conical portion between said bore covering portionand lig housing en gageable with and conforma. l ner face of a bottle atand below an internal e to the inannular ledge adjacent to its mouth. v

In testimony whereof EWALD G.' BAUM.

